Whether your summer ends abruptly at the start of September or tapers off gradually through the fall, Orlando wants you to keep it going with its second annual "Endless Summer" blowout.  From August 15 to November 15, the Orlando Visitors Bureau is running a "get one free" promotion: stay at any participating hotel for two or three nights and get one night free. Over 80 hotels are taking part, including Universal's Portofino Bay Hotel (see our review) and—for your sliming pleasure—the always-popular Nickelodeon Family Suites (see our review).   Attractions are getting in on the act, too.  Buy one ticket at a participating attraction and get a free second ticket, or purchase one round of golf and get the second on the house.  Other offers include discounted car rentals and admission to attractions such as Gatorland, SkyVenture Orlando, and Dinosaur World.